The Hairy Bikers' Winter Vegetable Soup - Veg Power

Ingredients

• 2 tbsp olive oil
• 1 onion, finely chopped
• 1 celery stick, finely chopped
• 600g root vegetables, such as carrots, parsnips, swede, turnips, celeriac, sliced or diced
• 150g beetroot (100g peeled and diced, 50g grated)
• 3 garlic cloves, finely chopped
• 1 tsp dried thyme or 2 sprigs of fresh
• 50g barley
• up to 1.5 litres vegetable stock
• 1 tsp Marmite
• 2 leeks, finely sliced
• 100g kale, shredded
• sea salt and black pepper